Our current era is an age of competition and development in various fields, the most important of which is the field of industries, which is one of the important criteria for measuring the development of any society, there are many types of industries including the construction industry. The construction process is a creative process that uses six main sources and creates a unique origin. These elements are materials, machinery, labor, engineering technology, finance, and, construction management, despite the important role of construction projects in our country, they are exposed during various stages to several problems in order to achievetheirs objectives, the most important of which is low on the site productivity in construction projects There are certainly reasons for the decline, and it also has risks and negative effects on the feasibility of the project. This research aims to study the factors affecting on the site productivity of construction projects in Khartoum State by focusing on the concept of productivity and its importance and methods of measurement, as well as the most important factors affecting them, in order to achieve this goal, it was necessary to adopt a special approach, where was designed questionnaire and interviews to examine these factors plaguing the construction sites, the results of the questionnaire showed that the percentage of establishments operating in the construction industry that train workers represents 30%, and that establishments operating in the construction industry that do not have a specific methodology for training workers are estimated at 60%, and the results of the analysis showed that the most important factors affecting on-site productivity related with workers in construction sites, such as the physical and moral incentives, the use of Modern technology, lack of training institutions for employees and the application of quality system. Based on these results, the proposed solutions were developed to improve the current situation, the need to develop human resources and create an appropriate work environment and review wage formats and methods of motivation and the use of modern technologies
